290HENDEESON'S HANDBOOK OP PLANTS OEM A genus ol hardy and hall-hardy herbaceous plants and shrubs, natives ol Europe and Northern India. O. vulgare, the wild Mar¬ joram, common throughout Europe, and natur¬ alized in this country, lurnishes the Oil ol Origanum, which is an acrid stimulant. O. (Mites and O. Majorana are included In the pot or seasoning herbs, under the name ol Marjoram. They are natives ol Sicily and Portugal, respectively. There are a few orna¬ mental species sometimes grown as house plante, the more common of which is O. sipyleum, a native of the Levant, and popularly known as Hop Plant. It is ol easy culture, and is propagated by cuttings.Ormoca'rpum. From ormos, a chain, and kar¬ pos, a fruit; referring to the narrow chain¬ like pods. Nat. Ord. Leguminosm. A genus consisting of three or four shrubs, natives of tropical Africa and the Indian Archipelago, nearly alUed to ^Mschynomene. O. Goronilloides has pale yellow flowers, borne In many-flowered axillary peduncles in May. Young specimens only are adapted to pot cul¬ ture, and are produced from cuttings.Ormo'sia. Bead Tree. From ormos, a neck¬ lace ; in allusion to this use of the seeds. Nat. Ord. Leguminosm. A smaU genus of omamental tropical trees, natives of Guiana and the West Indies. They are all too large for introduction into the green-house. O. dasycarpa is the West Indian Bead Tree, or Necklace Tree, the seeds of which, like those of O. cocdnea, a native of Guiana and Brazil, are nearly round, beauti¬ fully polished, and ot a bright scarlet color, with a black spot at one end, resembling beads, for which they are substituted, being made into bracelet^ necklaces, or mounted in silver for studs or buttons. The seeds are picked up on the seacoast in various places, at very great distances from where they grow, having been carried by strong oceanic cur¬ rents. They are usually mixed in with small shells, and sold as " Sea Beans," the common error being that they are the fruit of some sea plant.Omamental Grasses. See Grasses.Omamental Leaved Plants. These are such as are gro^wn for the beauty of their foliage. rather than for their flowers; such as the various Crotons, Dracaenas, Coleus, Dieffen- bachias, ete., with colored or variegated leaves; the numberless Palms, Fems, Agaves, Arallas, Elcinus, etc., with large showy or finely divided leaves, or possessing other remarkable characteristics in their foliage are also placed in this class.Ornamental Planting. The beauty of many of our country homes Is sadly marred by the in¬ judicious planting of omamental trees and shrubs. There is no branch of the land¬ scape gardener's art that demands more sound judgment, correct ideas, or refined taste, for It is not enough merely to be able to admire and appreciate a well defined and harmoniously col¬ ored landscape, and to judge of its merits or de¬ lects, but he must also be able to select the mate¬ rials, and so arrange or dispose of them as to produce an effect at once the most powerful, agreeable, and perfect, that they are capable of doing. To attain this end the planter requires an amount of skUl and knowledge only attaina- OEN ble by perseverance, study, and practice. These remarks apply principaUy to large and extensive country seats, but also bear -weight with regard to less pretentious residences. In lormer years the rage has been altogether lor mixed planting, without regard to the luture size ol the trees or shrubs planted, or to the effect ol the shades ol color, either in the summer or lall; but now a more tastelul and natural idea prevails, and planting In groups with reference to the general effect, the ulti¬ mate size ol the trees, and their coloring in summer and lall. Is more generaUy carried out. Trees having a resemblance to one another in the size and form ol their leaves may be associated in groups, but It Is more desirable that they possess some other marked characteristic in common, such as color ol foliage, bark, or fiower, habit ol gro-wth, or lorm, etc. Thus, when depth ol color in leal- age Is desired, fit associates are lound In the Purple Beech, Elm, Oak, Hazel, or Barberry; when light colors are wanted they are at com¬ mand In the Golden Birch, Alder, Elder, or WUlow, as also among the naturaUy sllvery- loliaged trees, as the Silver Poplar, Linden, Maple, Huntingdon and other WiUows, and Sea Buck Thorn, while among strictly varie¬ gated trees and shrubs, there exists a wide field to select from. The autumnal colors and tints ol lalling loliage deseive marked atten¬ tion. The rich scarlet and purple ol the Oaks, Llquldaraber, Nyssa, or Scarlet Maple; the golden-yellow ol the Norway and other Maples, Tulip Trees, etc.; the Chestnut, with its yel¬ low and bro-wn; gorgeous festoons ol the Vir¬ ginia Creeper and YeUow Celastrus, contrast¬ ing beautilully -with the deep green ol the Spruces, Hemlocks, or other evergreens. Color In bark is most appreciable when branches are denuded ol their loUage, and small groups having distinct colors tend to relieve the duU monotony ol the winter and early spring months. White Birch, Linden, Golden Ash, Purple, and Golden Willow, Vir¬ gilia lutea, the Bed Dogwood, ete., aU work in well; while Deutzias, Spiraeas, Welgelas, Chinese Magnolias, Tartarian Honeysuckle, the Dwarl Buck-eyes (Pavia), Hawthorns. Japanese Judas Tree, Hydrangea paniculata grandifiora, Bhododendrons, Azaleas, and a host ol other equally desirable shrubs, either singly or in groups, may fill up the foreground and give lightness and beauty to the carriage drive and lawn during the whole season. Irregularity ol outline to the lawn gives an Idea ol size, and the margins and points may be well filled up here and there by groups ol hardy herbaceous and other plants, Arundo Donax versicolor, A. conspicua, Eulalias, Pam¬ pas Grass, ete., in prominent positions in groups, or as single specimens on the lawn.Omithi'dium. Prom omis, a bird, and eidoa, like; the upper lip ol the stigma is beak-like. Nat. Ord. OrchidauxoB. A small genus ol curious Uttle Orchids, but not ol sufficient beauty or interest to warrant their Introduction Into the Orchid house. They are regarded as weeds among air plants.Ornitboce'phalus. From omia, omithoa, a bird, and kephale, a head; in reference to the lorm ot the column and anther. Nat. Ord. Orchidr